it's brake master cylinder time... what an unusual layout with BMC under the tank those Germans must have stayed up late to come up with this one. didn't want to order a BMC kit until I could inspect bore for pits too deep to hone out. looks like I lucked out, bore is in pretty good condition. can't same the same for my poor frame. brake fluid destroys the paint. what a mess underneath. bleed off port was completely plugged, not allowing brake fluid to flow back releasing calipers. hence why front brakes was locking up.